the concept of using classes is to interact with your database tables as objects and this of course will be better and easily when need to update certain row or record then you simply update the...

It's not supported in the Upload control to upload directories instead you can compress this directory and upload it as single file.

you should manipulate some CSS into your website , also i recommend to use a design tool for your design task instead of VS to have a full design options and capabilities.

there are also some...

Yes it will works , but make sure that the .NET framework is installed on the destination server.
and as a better way publish your website from visual studio or package it.

you can also use a SQL datasource and assign the select statment mentioned by SheSaidImaPregy to its select query.

are you using a BasePage or override any methods manually ?

Use the below mehtod

public static void ShowMessageBox(string message)
{
if (!string.IsNullOrEmpty(message))
{
if (message.EndsWith("."))...

try

javascript:window.open(’javascript:window.close();’,'_self’,'’);

and please refer to this link for more details
http://www.interwebby.com/blog/2006/02/04/3/

you have many options to do so depend on what suites you

Session :
Session["Values"] = TextBox1.Text;

QueryString :
Response.Redirect("page.aspx?text=" + TextBox1.Text);

CrossPage Postback...

you can use another a[approach by using the new ASP.NET 2.0 control which called MultiView control and set the active view depending on selected dropdown item.
...

I'm totally recommended this tutorial for you @MSDN
http://msdn2.microsoft.com/en-us/library/aa479344.aspx

Also the Data access tutorials at ASP.NET website http://www.asp.net/learn/data-access/

Hello dskumar_85 , you have to implement your custom way either form client side as a validation or ASP.NET validator or event when the user click submit button to verify that the mail he has entered...